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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb064871b95d63ee34c42c97c6f0225c2da1ab14a1b7a63671423d2ef18ebe8' 
  AND token = 'fEYLUA5OsDSr784qeZ7QxrZ3POCFLTnd3Mq/so5KR3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}